18k Gold Plated Engagement Ring Set with Channel and Prong Set Round Cut Clear Cubic Zirconia Polished into a Lustrous Goldtone Finish. This ring is an absolute classic and it looks absolutely fabulous. The center stone is 1.35 carat simulated size set on rhodium prongs. The side shoulders boast another .95 carats worth of stones to make a 2.3 total carat weight cubic zirconia ring. We also have a silver tone version available. 18k plated gold is achieved using an electroplating process that coats the item with heavy layers of 18k Yellow Gold and color-treated to display a perfect 14k Hamilton gold color.